general use test instruments

Question 1

A portable test instrument is used to take real-time (momentary) measurements.

Answer 1

true

Question 2

A permanent test instrument is a device that is installed in a process, or at a bench, to continually measure and display quantities.

Answer 2

true

Question 3

AC current is current in a circuit that flows in one direction only.

Answer 3

false

Question 4

AC voltage is voltage in a circuit that reverses its direction of flow at regular intervals, and is stated and measured as peak, average, or ? value.

Answer 4

rms

Question 5

The ? value of a sine wave is the maximum instantaneous value of either the positive or negative values in the sine wave.

Answer 5

peak

Question 6

Voltage indicators only indicate that voltage and current are present; they do not indicate the actual voltage

Answer 6

false

Question 7

A voltage indicator needs only to be near a voltage source to indicate the presence of voltage.

Answer 7

true

Question 8

When voltage measurements are different from what is expected, the voltage measurement is most likely to be lower than normal.

Answer 8

true

Question 9

A(n) ? is a test meter that measures resistance, the opposition to the flow of electrons in a circuit.

Answer 9

ohmmeter

Question 10

The higher the resistance in a circuit, the higher the current flow through the circuit.

Answer 10

false

Question 11

A closed switch that is operating properly has continuity.

Answer 11

true

Question 12

An ohmmeter is used to measure the ?

Answer 12

resistance

Question 13

When using an ohmmeter, the resistance of all components connected in parallel with the component being tested affects, and typically lowers, the resistance reading.

Answer 13

true

Question 14

A megohmmeter is a high-resistance ohmmeter used to measure insulation deterioration on various wires by measuring high-resistance values during high voltage test conditions.

Answer 14

trur

Question 15

? leakage current is current that flows from areas on conductors where insulation has been removed to allow electrical connections.

Answer 15

surface

Question 16

A clamp-on ammeter is a test instrument that measures current in a circuit by measuring the strength of the ? around a single conductor.

Answer 16

magnetic field

Question 17

In-line ammeters require the circuit to be ? so the ammeter can be inserted into the circuit to acquire a reading.

Answer 17

opened

Question 18

A clamp-on ammeter is typically used to measure current in a circuit with over one ampere of current.

Answer 18

true

Question 19

Measuring current is useful because only current can be used to determine how much a circuit is loaded (working).

Answer 19

true

Question 20

Many test instruments include a ? in the current-measuring circuit to prevent damage caused by excessive current.

Answer 20

fuse

Question 21

One problem with small 3-phase voltage imbalances is that they cause high ? imbalances.

Answer 21

current

Question 22

When a 3-phase current unbalance exceeds ? , a test for voltage unbalance should be performed.

Answer 22

10%

Question 23

Most analog multimeters do not have calibrated scales that correspond to the different selector switch settings.

Answer 23

false

Question 24

Most digital multimeter displays include a(n) ? to show changes and trends in a circuit.

Answer 24

bar graph

Question 25

Voltage measurements using the ? on a digital multimeter are useful in identifying low voltage conditions.

Answer 25

min/max mode